APU

Question 1

How many consecutive APU start attempts

Answer 1

After three consecutive APU start attempts, the flight crew must wait 60 min before a new start attempt.

Question 2

During refuel/defuel procedures, APU starts, or shutdowns are permitted with what restrictions.

Answer 2

If the APU failed to start or following an automatic APU shutdown, do not start the APU.
If a fuel spill occurs, perform a normal APU shutdown.

Question 3

APU - Max altitude to assist engine start.

Answer 3

20 000 ft

Question 4

APU - Max altitude for air conditioning and pressurization (single-pack operation).

Answer 4

22 500 ft

Question 5

APU - Max altitude for air conditioning and pressurization (dual pack operation).

Answer 5

15 000 ft

Question 6

Use of APU bleed air for wing anti-ice is not permitted. T or F

Answer 6

True